Portable power-driven tool



APHl 9, 1929- O. P. WODACK ET 'AL PORTABLE POWER DRIVEN T001.

2 Sheets-Sheet Filed June ll, 1926 April 9, 1929 o. P. woDAcK ET AL1,708,345

' PORTABLE POWER DRIVEN TOOL Filed June 11, 192e 'l 2 sheets-sheet 2Patented Apr. 9, 1929.

UNITED STATES titane PATENT orifice.

OSCAR P.; WODACK, OF CHICAGO, AND JOSEPH F. HAAS, OF FOREST I JARK,ILLINOIS, ASSIGNORS TO WODACK ELECTRIC TOOL CORPORATION, OF CHICAGO,LLINOIS, A

CORPORATION OF ILLINOS.

PORTABLE POWER-DRIVER' TOOL.

Application led June 11,

rThe invention relates to portable power driven tools, and moreparticularly to port able power driven circular saws.

One object of the invention is to produce a portable power driven sawhaving a supporting structure including a motor Casing, with a guiderest through which the saw blade projects, and means adjustablyconnecting the guide rest to the supporting structure so as to permitthe angular relation of the guide rest and motor frame to be varied atwill7 and also the depth of cut to be changed as desired.

Another object of the invention is to provide a portable power drivensaw having a support-ing structure equipped with a carrying handle, anda guard automatically movable into and out of operative relation to thesaw blade when the tool is removed from the work and suspended by thehandle, thereby protecting the user when carrying the saw from place toplace, and furthermore providing a protective rest for the saw when notlin use.

Further objects and advantages of the invention will become apparent asthe description proceeds.

In the drawings:

Figure 1 is a side elevation of theinvention in its preferred form.

Fig. 2 is a plan View thereof.

Fig. 3 is a view taken from the side opposite to that of Fig. l,showing, in dotted lines, a pivoted position of the saw frame.

Fig. l is a section along the line ll-l of Fic. 1.

Fig. Fig. 2.

Fig. 6 is a section along the line 6-6 of Fig. 5.

Fig. 7 is an enlarged view of a portion of the tool rest and guide.

Fig. 8 is a section along the line 8-8 of Fig. 7.

While we have shown in the drawings and will herein describe in detailthe preferred embodiment of the invention, it is to be understood thatwe do not thereby intend to limit the invention to the specific formdisclosed, but aim to cover all modifications and alternativeconstructions falling within the spirit and scope of the invention aseX- pressed in the appended claims.

5 is a section along the line 5-5 of 1,926. Serial N0. 115,226.

ln the form selected for purposes of disclosure the invention comprisesan electric motor housed in an aluminum casing 1, one end shield 2 ofwhich extends axially therefrom in the form of a tubular shell 3 toprovide a support for a bearing member il, these parts being securedrigidly together to form a frame for theV tool. At the op posite end ofthe motor casing 1 an end shield 5 is formed integrally therewith toprovide a bearing for the armature shaft of the motor andto partiallyenclose that end of the casing. Apertures 6 in this end shield permitair to enter for Ventilating and other purposes.

A handle 7 rigid with the motor casing l, carries a rectangular boX 8which is formed in the upper portion of the handle and serves to house aswitch (not shown). The switch is preferably operable by means of atrigger 9 positioned conveniently to the forelinger of the hand of anoperator, manipulation of this trigger closing the switch to connect themotor terminals to the power lines in a cord 10.

The end shield 2 at the saw end of the motor frame has a circular plateor disk portion 11 secured to the frame by means of set screws 12. Thetubular shell 3 hereinbefore mentioned as being integral with this endshield, extends axially outward from this disk portion, to support thebearing member 4. This member is shown in the drawings (Figs. 5 and 6)in the form of a hollow rectangular block having an end wall 14, a topwall 15, a bottom wall 16, and a rear wall 17. A detachable cover 18 issecured thereto by means of bolts 19.

The member 4ris secured to the shell 3 by means of bolt-s 2() passingthrough apertures in an end flange 21 on the shell and into threadedengagement with the block. A cylindrically formed tubular member 13 proijecting beyond the flange 21 is adapted to lit snugly within a bore 13Lin the block il. As shown in Fig. 5 the member 13 and the end wall 14Cform supports for a pair of ball bearings 22 and 28m which a shaft 24Eis journaled. This shaft extends through a bore 25 in the member 13 andinto the shell 3 to a point adjacent the end of the motor shaft 26. Theends 27 and 28 of these shafts are preferably squared. off. andconnected by i to means of an internally squared sleeve coutiling-29kThis coupling is suleiently rigid to permit the bearings of the shaft24: to act as a support for the saw end of the motor shaft. f j

A saw arbor 30`is journaled in the block 4 in ball'b'earings 31 and 32at right angles to the shaft 24. This arbor has a Worm gear 30a keyedthereto which meshes with ay Worm 2li@ on the shaft 24 whereby to establish a driving connection between the motor and saw arbor. The bearing3l is supported in a-cup shaped projection 341-: on the inside of thecover 178, and the bearing. 32 lis supported similarly in the rear Wall17 or the bearing block. f

In portable tools any vibration suchv as caused by an imperfect dynamicbalance ot As illustrated herein this saw mounting comprises a yioldablemeans supporting the saw ont'he arbor. Thus a saw 38 is clampedbetiveencollars 3Ta11d40, the collar 37 hav ing a sleeve portion 37aupon which the saw and collar 4()V may be positioned. A: nut 401.engaging sei-ev7 threads on the sleeve 37a serves to-clamp the collarsandisaw'together. This sleeve portion 37CL of the collar is adapt'- edlto fit over the. outer endo the arbor and against a shoulder 33a for-medbyA an` enlarged portion 33A of the arbor Which is adapted"4 torotatefreely Within a bere 35 `through the rear Wall 17 of the bearingblock and Within an annular' flange 36 eX- tending therefrom.A Ayieldablebushing 39 of rubber-or other suitable material isinterposedbetfieen the arbor and the sleeve 37 to permit radial'movementof the saw relative to the arbor. A pin 731entered'through concentricapertures 74, 75 and 76 inthe collar 37%, buslling 39 and arborfl()respeef tively, is held in place by thesaw and cellar' 40. The apertures74 and', 75 are slightly larger than the pin. In this Way thecollarsB'Tl and 40 andthesavv 381cla1'nped therebetween lare freetofloat radially on 'the arbor scthat it this unit is not perfectlybalanced' it may find its center7V androtate thereabout. A pm 37Abrcarried upon 4thecollar37'is adapted to enter apertures 38d andY asubstantially semi-.circular ring 4t2' oE Us shaped cross sectionkadapted .to overlie the edge of thesavv. Integral inwardly extendingarms43, 44 and l5 carry a hub tvwhieh is supported on the frame'of the tool.hub has a central bore 4:7 adapted to engage Va bearing surface t8formed enthe'outside ing a pair of lugs 4.9 and' 50 extending out- 1Wardly from the hub- 'adjacent a slit 51 thereinso to permit a set screw52; which passes freely through an aperture in one lug and into threadedengagement Vwith the other, to clamp the hub on the annular' liange. y

Means is also provided in the form eta tool rest to support and guidethe teol relative tothe wor-k being cut. For this purpose a slot-tedplate Vor frame 53 (Fig. 2) formed with av pair oit ribbed side members5d and end members 55, is urovid'ed with Aupstanding arms 56 on oppositesides oiE the saw which rareadjustably connectedV with the saWguardl'tl. The trame is ot a size adaptedtov surround the sawdiametrically to permit the saw toprotrude therethrough- The adjustableconnection between the arms 5G and the saw guard comprises a bolt 57 anfchored in the arm on one sidey of the guard, anda boltl 58 anchored in adow1 Wardly Aextendingv bracket 59 on the opposite side 'of the guard,these beltsbeing` adapted to enter longitudinal slots 60 in the arms 56.lVing'nutsGl and Washers G2 are'provided on these bolts te clamp thearms against the guard, thereby to seeure the support in its adjustedposition relative tev the guard.

lVhen the saw is to be used for cutting` strips a guide edge (i3 maybeattachedto-the frame vFor this purpose `lugs Gfl are This Y formed;onythe trame 53, adaptedto receive j the threaded ends of cap screwstlwvhich pass through apertures in the edge'i3 to clampthe-edge to theirame. z g

A handle 66 for the left hand of thejoperator, is preferably provided tepermit oit ready manipulation of the tool; Thi dle, as illustratedherein, has an extending bracket (37 whichis secured lo the` motor frameby means ef set screws' G3.

It will be apparent ,from the foregoing description that the frame oithe toolmay swing in the plane ol 'the saw to permit the tool tot beused in restricted spaces. Thus the angular adjustment ofV the saw'guard-is possible Without reducingthe depthfeii cut obtainable Vith the saw,4y

It .will also be apparent thatw-ith thet-eol restsecured to thefpivotedguard, the tool mayy be inclined vwith respect tothe Work WithoutVdisturbinfg' the,A adjustment of! the tool rest .relative to: the saavvaxis.; This s ipfoases particularly desirable as it greatly simpliiiesthe adjustment and manipulation et the tool.

A flexible conduit 69 may be secured at one end to the motor casing l ofthe motor traine by means of a iitting (S9a to communicate with theinterior of the trame at a point adjacent the discharge end of a 'fan 70(Fig. 3) which is suitably secured to the motor shaft. rllhe other end7l of this conduit isi adapted to be placed in a position to dischargeair from the 'ian to blow the saw-dust away from in front of the saw.rllhis conduit is preferably of a spiral metallic type adapted .toremain in its adjusted position without the use of aclainp adjacent itstree end. As apparent from the drawing, it the tool is inverted thefitting 69a, the guard 4l and the switch boX 8 are adapted to serve as athree-point support for the tool and permit of its use as a saw bench.

lhen a tool oiI this type is not in use, it is customary `for theoperator to carry it from place to place by holding the handle 7 in onehand and permitting the tool to hang vertically. This method of carryingthe tool Otten results in the under side of the saw blade swingingagainst the leg of the operator.

on the rear endet thel frame 53 of the tool rest. As shown in Fig. lthis guard, when the saw is in use, is swung up so that its free end issupported upon the work and the guard trails the tool rest. Whomhowever, the saw is withdrawn 'from the work and the tool is held wit-hthe handle 7 uppermost, the guard 78 swings by gravity to the dottedline position wherein it hangs adjacent the projecting portion ot thesaw, an adjacent portion Sl of the frame 53 being adapted to engage theedge of the guard to prevent the guard from rubbing against the saw.Thus the guard eiiectively protects both the saw and the operator frominjury.

The means for yieldably- `mounting the saw blade on the arbor is notherein claimed, the saine having been made the subject ot divisionalapplication Serial No. 175,651 tiled March 16, 1927,1by Joseph F. Haas.

lWe claim as our invention:

l. A portable power driven tool ot the character described comprising,in combination, a trame, a motor having a casing rigid with the frame, asaw arbor journaled on said frame, driving means connecting the motorand said arbor, a saw guardcarried pivotally on said .traine so as to beswinga-ble about said arbor while overlying the upper edge of a sawblade on the arbor, and a tool rest carried adjustably on aid guard.

2. A portable power driven saw comprisa main body having a handle at onecrdi` and means for supporting a circular saw to rotate on a transverseaxis at the other end et the body, a guard for the saw, and a restcarried by and adjustable toward and from said guard, said guard andbody being relatively adjustable about the axis ot the saw to permit avariation in the angular relation ot the body to the rest.

3. ln a portable power driven tool ot the character described, thecombination of a trame, a handle at one end of the trame, a saw arborjournaled in the other end ot the trame, a saw on said arbor, and aguard for the unde ide of said saw, said guard being mounted so as to bemovable into an inoperative position when the tool is in use and adaptedtoy gravitate into an operative position relative to the saw when thetool is vertically supported with the handle uppermost.

Il. In a portable power driven tool having a circular saw, thecombination oit a saw guard pivotally adjustable about the axis of saidsaw, and guiding rest carried by said guard, said rest'being' mountedfor adjustine-nt substantially radially from said saw axis.

5. ln a portable power driven tool having a circular saw, thecombination of a saw guard pivotally adjustable about the aXis of saidsaw, and an adjustable guiding rest having 'front and rear support onsaid guard permitting variable positioning ot said rest relative to theairis of said saw.

G. ln a portable power driven tool, the combination ot a saw, lasupporting traine having a handle, a relatively fixed guard extendingabout the cutting edge of said saw excepting the normal cutting portionthereof, and a second guard pivotally supported between said handle andsaid saw whereby said second guard swings into a trailing position freeof said saw when the latter is in normal cutting position and swingsadjacent the exposed cuttingl portion et said saw when said supporting'frame is suspended by said handle.

7. in a portable power driven tool the combination of a saw, asupporting frame for said saw, a relatively iixed guard extending aboutthe cutting edge of said saw excepting the normal cutting portionthereof, a guide rest mounted on said ,guard and having the cuttingportion of said saw extending thereby, and a second guard pivotallysupported to be swung tree ot said saw by the worlr being operated upon,and adapted to gravitate into protective relation tothe cuttingpor-tiony or said Saw when said Supporting Vframe is carriedvvith saidsaw irl-suspended position.

8. In a portable power driven tool the` combination of a saw, asupporting frame, a relatively stationary guard extending about thecutting edge ot said saw excepting the normal cuttingportion thereoi, aguide rest mounted on aard guard and having the cutting portion of saidsaw extending thereby, and a second guard pivoted on said guide vrestand normally positioned in adjacent protective relation to the cuttingportion oit said saw, said second guard being adapted to be swung `reeof said saw by the work being operated upon.

9. A. portable power driven tool having, in combination, a saw blade, asupporting structiue on which said blade is mounted and including aguard extending about the cutting edgev of the saw blade cxeeptingllienormal cutting portion thereof, a guide rest structurer on which saidblade is mounted and includingy a guard extending about the cutting edgeolthe saw blade excepting the normal cutting portion thereof, a' guiderest `mounted on said structure in operative rela tion to the saw blade,and a second guard pivoted on said rest'so as tobe slidable in atrailing position upon the surface of the work being eut,lsaid secondguard having a part adapted to engageA with theV rest to limit theswinging movement of the guard toward the saw blade. Y

lvl.V A` portable power driven saw comprising arsupporting structureincluding a n-p tor easing, a handle rigid with one end of the casing, asaw arbor journaled trans# versely in said supporting structure at theother endof the `casing and adaptedto car-ry a saw blade, saidsupporting structure in-V cluding an arcuate guard for the upper portionofl the saw blade,` a guide rest inthe 'form of an elongated plate*having a slot therein through which the lower portion of the sawbladeprojects, means adjustably connecting thel guide rest to the supportingstructure, and a second guard pivot-ed to saidy guide rest at the en dthereot adjacent the motor easing'and adapted to gravitate intoprotective relation to the' bladewhen vthe saw is suspended by thehandle. 1

In testimony lwhereof we have hereunto aliixed our signatures.

osoAR- rp wonnen.` Josnrn F. Haile.

